Defect Formation Monitoring Using Acoustic Emission Method During Friction Stir Welding Process

Authors

  • А.В. Левихина Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS (Tomsk, Russia)
  • В.Е. Рубцов Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS (Tomsk, Russia)
  • Е.А. Колубаев Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS (Tomsk, Russia)

DOI:

https://doi.org/10.14258/izvasu(2017)4-06

Keywords:

friction stir welding, plastic deformation, nondestructive control, acoustic emission

Abstract

The paper considers the possibility of applying the acoustic emission method for online monitoring of the friction stir welding process. A rolled sheet of clad aluminum alloy A2024 with a thickness of 5 mm has been used as the welded material. Welding has been carried out with some deviations from the optimum to get a defective structure formation. It is shown that acoustic emission in real time mode allows for identification of defects presence in the weld seam, as well as defects localization. It is proposed to use the energy and the median frequency of the acoustic emission signal as informative parameters. The energy of acoustic emission signals recorded during elding permits to distinguish four stages of the process: the initial interaction of the tool with the welded material, the input of the tool for the entire thickness of the material, the formation of a welded joint and the output of the tool. A Fourier window transformation technique has been used to calculate the median frequency required to determine the correlation between the defective structure of welded joints and the characteristics of the acoustic emission signals obtained during welding. It is shown that there is a significant increase in the median frequency in the defect formation zone which is linked to deterioration of convective transfer conditions of the welded material around the tool.

DOI 10.14258/izvasu(2017)4-06

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Author Biographies

  • А.В. Левихина, Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS (Tomsk, Russia)
    инженер лаборатории контроля качества материалов и конструкций
  • В.Е. Рубцов, Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS (Tomsk, Russia)
    кандидат физико-математических наук, старший научный сотрудник лаборатории физики упрочнения поверхности
  • Е.А. Колубаев, Institute of Strength Physics and Materials Science of the Siberian Branch of the RAS (Tomsk, Russia)
    доктор технических наук, заведующий лабораторией контроля качества материалов и конструкций

References

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No. 4(96) (2017): Известия Алтайского государственного университета

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How to Cite

Defect Formation Monitoring Using Acoustic Emission Method During Friction Stir Welding Process. (2017). Izvestiya of Altai State University, 4(96). https://doi.org/10.14258/izvasu(2017)4-06

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